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[Bartłomiej Żogała <984794@xxxxxxxxxxxxxxxxxx>]

Is that leak related?
cardpeek$ valgrind --track-origins=yes ./cardpeek
==3428== Memcheck, a memory error detector
==3428== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==3428== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==3428== Command: ./cardpeek
==3428== 
==3428== Conditional jump or move depends on uninitialised value(s)
==3428==    at 0xBBE3F22: sse2_combine_over_u (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.32.6)
==3428==    by 0xBBC953A: general_composite_rect (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.32.6)
==3428==    by 0xBB7CD80: pixman_image_composite32 (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.32.6)
==3428==    by 0x63C8204: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x640D190: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x63FF562: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x63FFFD4: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x6400B19: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x63BB8DE: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x63CCDF1: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x6403F55: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==    by 0x63C3A2E: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.2)
==3428==  Uninitialised value was created by a stack allocation
==3428==    at 0xBBC9280: general_composite_rect (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.32.6)

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https://bugs.launchpad.net/bugs/984794

Title:
  compiz crashed with SIGSEGV in general_composite_rect()

Status in cairo package in Ubuntu:
  Confirmed

Bug description:
  The crash occured when I logged into my desktop account. I saw the
  desktop, it went off, then came back... I have an up to date system.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: unity 5.10.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  ApportVersion: 2.0.1-0ubuntu4
  Architecture: amd64
  Date: Wed Apr 18 17:13:08 2012
  Disassembly: => 0x0:	Cannot access memory at address 0x0
  ExecutablePath: /usr/bin/compiz
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  ProcCmdline: compiz
  ProcEnviron:
   LANGUAGE=en_IN:en
   PATH=(custom, no user)
   LANG=en_IN
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x0:	Cannot access memory at address 0x0
   PC (0x00000000) not located in a known VMA region (needed executable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: unity
  StacktraceTop:
   ?? ()
   ?? () from /usr/lib/x86_64-linux-gnu/libpixman-1.so.0
   pixman_image_composite32 () from /usr/lib/x86_64-linux-gnu/libpixman-1.so.0
   ?? () from /usr/lib/x86_64-linux-gnu/libcairo.so.2
   ?? () from /usr/lib/x86_64-linux-gnu/libcairo.so.2
  Title: compiz crashed with SIGSEGV in pixman_image_composite32()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo tty

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